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Uranium(VI) adsorption from aqueous solutions using poly(vinyl alcohol)/carbon nanotube composites

机译：使用聚（乙烯醇）/碳纳米管复合材料从水溶液中吸附铀（VI）

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摘要

Poly(vinyl alcohol)/multiwalled carbon nanotubes (PVA/MWCNTs) composite hydrogels were prepared by a dispersion method and their ability to adsorb and remove uranyl ions from aqueous solutions was investigated. The prepared composites were characterized by XRD, TEM, SEM and FTIR. The effect of contact time, solution pH, initial UO22+ ion concentration and temperature on UO22+ ion adsorption from aqueous solution onto the prepared hydrogels was studied. The obtained results illustrated that, dispersion of MWCNTs into the PVA matrix enhanced the removal efficiency of UO22+ ions compared to PVA only. The Langmuir and Freundlich adsorption models have been applied to evaluate the adsorption efficiency and the data correlated well with the Langmuir model. Thermodynamic parameters (Delta H degrees, Delta S degrees, Delta G degrees) were determined which indicated that the UO22+ ion adsorption process onto the prepared hydrogels was exothermic and spontaneous. The adsorbed UO22+ can be desorbed effectively by 0.1 M EDTA.
机译：通过分散方法制备聚（乙烯醇）/多晶碳纳米管（PVA / MWCNT）复合水凝胶，并研究了它们吸附和除去水溶液中铀酰离子的能力。制备的复合材料以XRD，TEM，SEM和FTIR为特征。研究了接触时间，溶液pH，初始UO22 +离子浓度和温度对在制备的水凝胶水溶液中的UO22 +离子吸附的影响。得到的结果表明，与PVA相比，MWCNT分散到PVA基质中的去除效率增强了UO22 +离子的去除效率。 Langmuir和Freundlich吸附模型已被应用于评估吸附效率和数据与Langmuir模型很好。测定热力学参数（Delta H度，δ，δG度），表明UO22 +离子吸附过程在制备的水凝胶上是放热和自发的。吸附的UO22 +可以有效地解吸0.1M EDTA。

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  • 来源
    《RSC Advances》 |2015年第91期|共10页
  • 作者

    Abdeen Z.; Akl Z. F.;

  • 作者单位

    EPRI Petrochem Dept Cairo 11727 Egypt;

    ENRRA Nucl Safeguards &

    Phys Protect Dept Cairo Egypt;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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